التفاصيل البيبلوغرافية
| العنوان: |
Near-infrared and Optical Observations of Type Ic SN 2021krf: Luminous Late-time Emission and Dust Formation. |
| المؤلفون: |
Ravi, Aravind P., Rho, Jeonghee, Park, Sangwook, Park, Seong Hyun, Yoon, Sung-Chul, Geballe, T. R., Vinkó, Jozsef, Tinyanont, Samaporn, Bostroem, K. Azalee, Burke, Jamison, Hiramatsu, Daichi, Howell, D. Andrew, McCully, Curtis, Newsome, Megan, Gonzalez, Estefania Padilla, Pellegrino, Craig, Cartier, Regis, Pritchard, Tyler, Andersen, Morten, Blinnikov, Sergey |
| المصدر: |
Astrophysical Journal; 6/10/2023, Vol. 950 Issue 1, p1-23, 23p |
| مصطلحات موضوعية: |
MAGNETARS, TYPE I supernovae, RADIOACTIVE decay, DUST, LIGHT curves, STELLAR mass, ACTINIC flux |
| مستخلص: |
We present near-infrared (NIR) and optical observations of the Type Ic supernova (SN Ic) SN 2021krf obtained between days 13 and 259 at several ground-based telescopes. The NIR spectrum at day 68 exhibits a rising K -band continuum flux density longward of ∼2.0 μ m, and a late-time optical spectrum at day 259 shows strong [O i ] 6300 and 6364 Å emission-line asymmetry, both indicating the presence of dust, likely formed in the SN ejecta. We estimate a carbon-grain dust mass of ∼2 × 10−5 M ⊙ and a dust temperature of ∼900–1200 K associated with this rising continuum and suggest the dust has formed in SN ejecta. Utilizing the one-dimensional multigroup radiation-hydrodynamics code STELLA, we present two degenerate progenitor solutions for SN 2021krf, characterized by C–O star masses of 3.93 and 5.74 M ⊙, but with the same best-fit 56Ni mass of 0.11 M ⊙ for early times (0–70 days). At late times (70–300 days), optical light curves of SN 2021krf decline substantially more slowly than those expected from 56Co radioactive decay. Lack of H and He lines in the late-time SN spectrum suggests the absence of significant interaction of the ejecta with the circumstellar medium. We reproduce the entire bolometric light curve with a combination of radioactive decay and an additional powering source in the form of a central engine of a millisecond pulsar with a magnetic field smaller than that of a typical magnetar. [ABSTRACT FROM AUTHOR] |
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